diff --git a/src/Illuminate/Auth/Access/Gate.php b/src/Illuminate/Auth/Access/Gate.php
index 3e3b17b806b1..9cc701561ea4 100644
--- a/src/Illuminate/Auth/Access/Gate.php
+++ b/src/Illuminate/Auth/Access/Gate.php
@@ -450,7 +450,7 @@ protected function callbackAllowsGuests($callback)
      */
     protected function parameterAllowsGuests($parameter)
     {
-        return ($parameter->getClass() && $parameter->allowsNull()) ||
+        return ($parameter->hasType() && $parameter->allowsNull()) ||
                ($parameter->isDefaultValueAvailable() && is_null($parameter->getDefaultValue()));
     }
 
diff --git a/src/Illuminate/Broadcasting/Broadcasters/Broadcaster.php b/src/Illuminate/Broadcasting/Broadcasters/Broadcaster.php
index 99950baea92f..f626187b069b 100644
--- a/src/Illuminate/Broadcasting/Broadcasters/Broadcaster.php
+++ b/src/Illuminate/Broadcasting/Broadcasters/Broadcaster.php
@@ -8,6 +8,7 @@
 use Illuminate\Contracts\Routing\BindingRegistrar;
 use Illuminate\Contracts\Routing\UrlRoutable;
 use Illuminate\Support\Arr;
+use Illuminate\Support\Reflector;
 use Illuminate\Support\Str;
 use ReflectionClass;
 use ReflectionFunction;
@@ -204,9 +205,9 @@ protected function resolveImplicitBindingIfPossible($key, $value, $callbackParam
                 continue;
             }
 
-            $instance = $parameter->getClass()->newInstance();
+            $className = Reflector::getParameterClassName($parameter);
 
-            if (! $model = $instance->resolveRouteBinding($value)) {
+            if (is_null($model = (new $className)->resolveRouteBinding($value))) {
                 throw new AccessDeniedHttpException;
             }
 
@@ -225,8 +226,8 @@ protected function resolveImplicitBindingIfPossible($key, $value, $callbackParam
      */
     protected function isImplicitlyBindable($key, $parameter)
     {
-        return $parameter->name === $key && $parameter->getClass() &&
-                        $parameter->getClass()->isSubclassOf(UrlRoutable::class);
+        return $parameter->getName() === $key &&
+                        Reflector::isParameterSubclassOf($parameter, UrlRoutable::class);
     }
 
     /**
diff --git a/src/Illuminate/Container/BoundMethod.php b/src/Illuminate/Container/BoundMethod.php
index 8501232621e7..f350d580e760 100644
--- a/src/Illuminate/Container/BoundMethod.php
+++ b/src/Illuminate/Container/BoundMethod.php
@@ -157,16 +157,20 @@ protected static function getCallReflector($callback)
     protected static function addDependencyForCallParameter($container, $parameter,
                                                             array &$parameters, &$dependencies)
     {
-        if (array_key_exists($parameter->name, $parameters)) {
-            $dependencies[] = $parameters[$parameter->name];
+        if (array_key_exists($parameter->getName(), $parameters)) {
+            $paramName = $parameter->getName();
 
-            unset($parameters[$parameter->name]);
-        } elseif ($parameter->getClass() && array_key_exists($parameter->getClass()->name, $parameters)) {
-            $dependencies[] = $parameters[$parameter->getClass()->name];
+            $dependencies[] = $parameters[$paramName];
 
-            unset($parameters[$parameter->getClass()->name]);
-        } elseif ($parameter->getClass()) {
-            $dependencies[] = $container->make($parameter->getClass()->name);
+            unset($parameters[$paramName]);
+        } elseif (! is_null($className = Util::getParameterClassName($parameter))) {
+            if (array_key_exists($className, $parameters)) {
+                $dependencies[] = $parameters[$className];
+
+                unset($parameters[$className]);
+            } else {
+                $dependencies[] = $container->make($className);
+            }
         } elseif ($parameter->isDefaultValueAvailable()) {
             $dependencies[] = $parameter->getDefaultValue();
         }
diff --git a/src/Illuminate/Container/Container.php b/src/Illuminate/Container/Container.php
index efcad236a264..c0e2082b360c 100755
--- a/src/Illuminate/Container/Container.php
+++ b/src/Illuminate/Container/Container.php
@@ -846,7 +846,7 @@ public function build($concrete)
     /**
      * Resolve all of the dependencies from the ReflectionParameters.
      *
-     * @param  array  $dependencies
+     * @param  \ReflectionParameter[]  $dependencies
      * @return array
      *
      * @throws \Illuminate\Contracts\Container\BindingResolutionException
@@ -868,7 +868,7 @@ protected function resolveDependencies(array $dependencies)
             // If the class is null, it means the dependency is a string or some other
             // primitive type which we can not resolve since it is not a class and
             // we will just bomb out with an error since we have no-where to go.
-            $results[] = is_null($dependency->getClass())
+            $results[] = is_null(Util::getParameterClassName($dependency))
                             ? $this->resolvePrimitive($dependency)
                             : $this->resolveClass($dependency);
         }
@@ -920,7 +920,7 @@ protected function getLastParameterOverride()
      */
     protected function resolvePrimitive(ReflectionParameter $parameter)
     {
-        if (! is_null($concrete = $this->getContextualConcrete('$'.$parameter->name))) {
+        if (! is_null($concrete = $this->getContextualConcrete('$'.$parameter->getName()))) {
             return $concrete instanceof Closure ? $concrete($this) : $concrete;
         }
 
@@ -942,7 +942,7 @@ protected function resolvePrimitive(ReflectionParameter $parameter)
     protected function resolveClass(ReflectionParameter $parameter)
     {
         try {
-            return $this->make($parameter->getClass()->name);
+            return $this->make(Util::getParameterClassName($parameter));
         }
 
         // If we can not resolve the class instance, we will check to see if the value
diff --git a/src/Illuminate/Container/Util.php b/src/Illuminate/Container/Util.php
index 5feca5510d06..86dac5b9b39c 100644
--- a/src/Illuminate/Container/Util.php
+++ b/src/Illuminate/Container/Util.php
@@ -35,4 +35,19 @@ public static function unwrapIfClosure($value)
     {
         return $value instanceof Closure ? $value() : $value;
     }
+
+    /**
+     * Get the class name of the given parameter's type, if possible.
+     *
+     * From Reflector::getParameterClassName() in Illuminate\Support.
+     *
+     * @param  \ReflectionParameter  $parameter
+     * @return string|null
+     */
+    public static function getParameterClassName($parameter)
+    {
+        $type = $parameter->getType();
+
+        return ($type && ! $type->isBuiltin()) ? $type->getName() : null;
+    }
 }
diff --git a/src/Illuminate/Foundation/Console/ClosureCommand.php b/src/Illuminate/Foundation/Console/ClosureCommand.php
index eb6ddc0eaaca..c0d736bdb3da 100644
--- a/src/Illuminate/Foundation/Console/ClosureCommand.php
+++ b/src/Illuminate/Foundation/Console/ClosureCommand.php
@@ -46,8 +46,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $parameters = [];
 
         foreach ((new ReflectionFunction($this->callback))->getParameters() as $parameter) {
-            if (isset($inputs[$parameter->name])) {
-                $parameters[$parameter->name] = $inputs[$parameter->name];
+            if (isset($inputs[$parameter->getName()])) {
+                $parameters[$parameter->getName()] = $inputs[$parameter->getName()];
             }
         }
 
diff --git a/src/Illuminate/Foundation/Events/DiscoverEvents.php b/src/Illuminate/Foundation/Events/DiscoverEvents.php
index 8d89e52805ac..0fa87135c9ff 100644
--- a/src/Illuminate/Foundation/Events/DiscoverEvents.php
+++ b/src/Illuminate/Foundation/Events/DiscoverEvents.php
@@ -2,6 +2,7 @@
 
 namespace Illuminate\Foundation\Events;
 
+use Illuminate\Support\Reflector;
 use Illuminate\Support\Str;
 use ReflectionClass;
 use ReflectionException;
@@ -58,7 +59,7 @@ protected static function getListenerEvents($listeners, $basePath)
                 }
 
                 $listenerEvents[$listener->name.'@'.$method->name] =
-                                optional($method->getParameters()[0]->getClass())->name;
+                                Reflector::getParameterClassName($method->getParameters()[0]);
             }
         }
 
diff --git a/src/Illuminate/Routing/ImplicitRouteBinding.php b/src/Illuminate/Routing/ImplicitRouteBinding.php
index b3b6ca088730..e30372dab807 100644
--- a/src/Illuminate/Routing/ImplicitRouteBinding.php
+++ b/src/Illuminate/Routing/ImplicitRouteBinding.php
@@ -4,6 +4,7 @@
 
 use Illuminate\Contracts\Routing\UrlRoutable;
 use Illuminate\Database\Eloquent\ModelNotFoundException;
+use Illuminate\Support\Reflector;
 use Illuminate\Support\Str;
 
 class ImplicitRouteBinding
@@ -22,7 +23,7 @@ public static function resolveForRoute($container, $route)
         $parameters = $route->parameters();
 
         foreach ($route->signatureParameters(UrlRoutable::class) as $parameter) {
-            if (! $parameterName = static::getParameterName($parameter->name, $parameters)) {
+            if (! $parameterName = static::getParameterName($parameter->getName(), $parameters)) {
                 continue;
             }
 
@@ -32,7 +33,7 @@ public static function resolveForRoute($container, $route)
                 continue;
             }
 
-            $instance = $container->make($parameter->getClass()->name);
+            $instance = $container->make(Reflector::getParameterClassName($parameter));
 
             if (! $model = $instance->resolveRouteBinding($parameterValue)) {
                 throw (new ModelNotFoundException)->setModel(get_class($instance), [$parameterValue]);
diff --git a/src/Illuminate/Routing/RouteDependencyResolverTrait.php b/src/Illuminate/Routing/RouteDependencyResolverTrait.php
index 17213d4a6f7e..b3e887b169cb 100644
--- a/src/Illuminate/Routing/RouteDependencyResolverTrait.php
+++ b/src/Illuminate/Routing/RouteDependencyResolverTrait.php
@@ -3,6 +3,7 @@
 namespace Illuminate\Routing;
 
 use Illuminate\Support\Arr;
+use Illuminate\Support\Reflector;
 use ReflectionFunctionAbstract;
 use ReflectionMethod;
 use ReflectionParameter;
@@ -68,15 +69,15 @@ public function resolveMethodDependencies(array $parameters, ReflectionFunctionA
      */
     protected function transformDependency(ReflectionParameter $parameter, $parameters)
     {
-        $class = $parameter->getClass();
+        $className = Reflector::getParameterClassName($parameter);
 
         // If the parameter has a type-hinted class, we will check to see if it is already in
         // the list of parameters. If it is we will just skip it as it is probably a model
         // binding and we do not want to mess with those; otherwise, we resolve it here.
-        if ($class && ! $this->alreadyInParameters($class->name, $parameters)) {
+        if ($className && ! $this->alreadyInParameters($className, $parameters)) {
             return $parameter->isDefaultValueAvailable()
                 ? $parameter->getDefaultValue()
-                : $this->container->make($class->name);
+                : $this->container->make($className);
         }
     }
 
diff --git a/src/Illuminate/Routing/RouteSignatureParameters.php b/src/Illuminate/Routing/RouteSignatureParameters.php
index fe5b170f5e3b..535d5edcbf32 100644
--- a/src/Illuminate/Routing/RouteSignatureParameters.php
+++ b/src/Illuminate/Routing/RouteSignatureParameters.php
@@ -2,6 +2,7 @@
 
 namespace Illuminate\Routing;
 
+use Illuminate\Support\Reflector;
 use Illuminate\Support\Str;
 use ReflectionFunction;
 use ReflectionMethod;
@@ -22,7 +23,7 @@ public static function fromAction(array $action, $subClass = null)
                         : (new ReflectionFunction($action['uses']))->getParameters();
 
         return is_null($subClass) ? $parameters : array_filter($parameters, function ($p) use ($subClass) {
-            return $p->getClass() && $p->getClass()->isSubclassOf($subClass);
+            return Reflector::isParameterSubclassOf($p, $subClass);
         });
     }
 
diff --git a/src/Illuminate/Support/Reflector.php b/src/Illuminate/Support/Reflector.php
new file mode 100644
index 000000000000..a38fed71bed8
--- /dev/null
+++ b/src/Illuminate/Support/Reflector.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace Illuminate\Support;
+
+use ReflectionClass;
+
+class Reflector
+{
+    /**
+     * Get the class name of the given parameter's type, if possible.
+     *
+     * @param  \ReflectionParameter  $parameter
+     * @return string|null
+     */
+    public static function getParameterClassName($parameter)
+    {
+        $type = $parameter->getType();
+
+        return ($type && ! $type->isBuiltin()) ? $type->getName() : null;
+    }
+
+    /**
+     * Determine if the parameter's type is a subclass of the given type.
+     *
+     * @param  \ReflectionParameter  $parameter
+     * @param  string  $className
+     * @return bool
+     */
+    public static function isParameterSubclassOf($parameter, $className)
+    {
+        $paramClassName = static::getParameterClassName($parameter);
+
+        return ($paramClassName && class_exists($paramClassName))
+            ? (new ReflectionClass($paramClassName))->isSubclassOf($className)
+            : false;
+    }
+}